: Check inside the soundhole for a paper label (often red, gold, or square with scrolls). The serial or model number is usually printed or stamped here.
Identifying the production year of an from 2021 is straightforward because modern Eko serial numbers typically embed the manufacture date within the first few digits. Decoding the Serial Number (2021 Models) eko guitar serial number lookup 2021
The shape of the pickguard (one-ply vs. three-ply) or the number of rivets on the bridge can distinguish between late 60s and early 70s builds. Eko Guitar Serial Number Search - Wakelet : Check inside the soundhole for a paper